Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java
===================================================================
diff -u -r097386be99ea405bd2786be1fca936840b75d3ac -r4534f2d5ac94650da2168a5ae794e084a8de67c5
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java	(.../Activity.java)	(revision 097386be99ea405bd2786be1fca936840b75d3ac)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java	(.../Activity.java)	(revision 4534f2d5ac94650da2168a5ae794e084a8de67c5)
@@ -799,4 +799,18 @@
 	 */
    public abstract Activity createCopy();
 
+   
+   // ---------------------------------------------------------------------
+   // Data Validation methods
+   //---------------------------------------------------------------------
+   
+   /**
+	 * Validate activity
+	 * 
+	 */
+	public String validateActivity() { 
+		return null; 
+	}
+   
+   
 }
\ No newline at end of file